git.sesse.net Git - vlc/blob - modules/video_filter/rotate.c

   1 /*****************************************************************************
   2  * rotate.c : video rotation filter
   3  *****************************************************************************
   4  * Copyright (C) 2000-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <math.h>                                            /* sin(), cos() */
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_vout.h>
  37
  38 #include "vlc_filter.h"
  39 #include "filter_picture.h"
  40
  41 /*****************************************************************************
  42  * Local prototypes
  43  *****************************************************************************/
  44 static int  Create    ( vlc_object_t * );
  45 static void Destroy   ( vlc_object_t * );
  46
  47 static picture_t *Filter( filter_t *, picture_t * );
  48 static picture_t *FilterPacked( filter_t *, picture_t * );
  49
  50 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  51                            vlc_value_t oldval, vlc_value_t newval,
  52                            void *p_data );
  53
  54 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  55                            vlc_value_t oldval, vlc_value_t newval,
  56                            void *p_data );
  57
  58 #define ANGLE_TEXT N_("Angle in degrees")
  59 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  60
  61 #define FILTER_PREFIX "rotate-"
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin ()
  67     set_description( N_("Rotate video filter") )
  68     set_shortname( N_( "Rotate" ))
  69     set_capability( "video filter2", 0 )
  70     set_category( CAT_VIDEO )
  71     set_subcategory( SUBCAT_VIDEO_VFILTER )
  72
  73     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
  74         ANGLE_TEXT, ANGLE_LONGTEXT, false )
  75
  76     add_shortcut( "rotate" )
  77     set_callbacks( Create, Destroy )
  78 vlc_module_end ()
  79
  80 static const char *const ppsz_filter_options[] = {
  81     "angle", NULL
  82 };
  83
  84 /*****************************************************************************
  85  * filter_sys_t
  86  *****************************************************************************/
  87 struct filter_sys_t
  88 {
  89     vlc_spinlock_t lock;
  90     int            i_cos;
  91     int            i_sin;
  92 };
  93
  94 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  95 {
  96     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  97     *i_sin = (int)(sin( f_angle )*4096.);
  98     *i_cos = (int)(cos( f_angle )*4096.);
  99 }
 100
 101 /*****************************************************************************
 102  * Create: allocates Distort video filter
 103  *****************************************************************************/
 104 static int Create( vlc_object_t *p_this )
 105 {
 106     filter_t *p_filter = (filter_t *)p_this;
 107     filter_sys_t *p_sys;
 108
 109     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 110     {
 111         msg_Err( p_filter, "Input and output chromas don't match" );
 112         return VLC_EGENERIC;
 113     }
 114
 115     switch( p_filter->fmt_in.video.i_chroma )
 116     {
 117         CASE_PLANAR_YUV
 118             p_filter->pf_video_filter = Filter;
 119             break;
 120
 121         CASE_PACKED_YUV_422
 122             p_filter->pf_video_filter = FilterPacked;
 123             break;
 124
 125         default:
 126             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 127                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 128             return VLC_EGENERIC;
 129     }
 130
 131     /* Allocate structure */
 132     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 133     if( p_filter->p_sys == NULL )
 134         return VLC_ENOMEM;
 135     p_sys = p_filter->p_sys;
 136
 137     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 138                        p_filter->p_cfg );
 139
 140     int i_angle = var_CreateGetIntegerCommand( p_filter,
 141                                                FILTER_PREFIX "angle" ) * 10;
 142     cache_trigo( i_angle, &p_sys->i_sin, &p_sys->i_cos );
 143     var_Create( p_filter, FILTER_PREFIX "deciangle",
 144                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 145     vlc_spin_init( &p_sys->lock );
 146     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 147     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 148                      PreciseRotateCallback, p_sys );
 149
 150
 151     return VLC_SUCCESS;
 152 }
 153
 154 /*****************************************************************************
 155  * Destroy: destroy Distort filter
 156  *****************************************************************************/
 157 static void Destroy( vlc_object_t *p_this )
 158 {
 159     filter_t *p_filter = (filter_t *)p_this;
 160
 161     var_DelCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_filter->p_sys );
 162     var_DelCallback( p_filter, FILTER_PREFIX "deciangle",
 163                      PreciseRotateCallback, p_filter->p_sys );
 164     vlc_spin_destroy( &p_filter->p_sys->lock );
 165     free( p_filter->p_sys );
 166 }
 167
 168 /*****************************************************************************
 169  *
 170  *****************************************************************************/
 171 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 172 {
 173     picture_t *p_outpic;
 174     filter_sys_t *p_sys = p_filter->p_sys;
 175     int i_sin, i_cos;
 176
 177     if( !p_pic ) return NULL;
 178
 179     p_outpic = filter_NewPicture( p_filter );
 180     if( !p_outpic )
 181     {
 182         picture_Release( p_pic );
 183         return NULL;
 184     }
 185
 186     vlc_spin_lock( &p_sys->lock );
 187     i_sin = p_sys->i_sin;
 188     i_cos = p_sys->i_cos;
 189     vlc_spin_unlock( &p_sys->lock );
 190
 191     for( int i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 192     {
 193         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 194         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 195         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 196         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 197
 198         const int i_aspect = ( i_visible_lines * p_pic->p[Y_PLANE].i_visible_pitch ) / ( p_pic->p[Y_PLANE].i_visible_lines * i_visible_pitch );
 199         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 200
 201         const int i_line_center = i_visible_lines>>1;
 202         const int i_col_center  = i_visible_pitch>>1;
 203
 204         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 205         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 206         uint8_t *p_outendline = p_out + i_visible_pitch;
 207         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 208
 209         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 210
 211         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 212         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 213         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 214                              - i_sin * i_col_center + (1<<11) );
 215         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 216                            - i_cos * i_col_center + (1<<11);
 217         for( ; p_outendline < p_outend;
 218              p_out += i_hidden_pitch, p_outendline += i_pitch,
 219              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 220         {
 221             for( ; p_out < p_outendline;
 222                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 223             {
 224                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 225                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 226                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 227                                                 + i_col_orig;
 228                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 229                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 230
 231                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 232                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 233                 {
 234                 #define test 1
 235                 #undef test
 236                 #ifdef test
 237                     if( ( i_col_orig > i_visible_pitch/2 ) )
 238                 #endif
 239                     {
 240                         uint8_t i_curpix = black_pixel;
 241                         uint8_t i_colpix = black_pixel;
 242                         uint8_t i_linpix = black_pixel;
 243                         uint8_t i_nexpix = black_pixel;
 244                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 245                             i_curpix = *p_orig_offset;
 246                         p_orig_offset++;
 247
 248                         if(  ( i_col_orig < i_visible_pitch - 1)
 249                              && ( i_line_orig >= 0 ) )
 250                             i_colpix = *p_orig_offset;
 251
 252                         p_orig_offset+=i_pitch;
 253                         if( ( i_line_orig < i_visible_lines - 1)
 254                             && ( i_col_orig  < i_visible_pitch - 1) )
 255                             i_nexpix = *p_orig_offset;
 256
 257                         p_orig_offset--;
 258                         if(  ( i_line_orig < i_visible_lines - 1)
 259                              && ( i_col_orig >= 0 ) )
 260                             i_linpix = *p_orig_offset;
 261
 262                         unsigned int temp = 0;
 263                         temp+= i_curpix *
 264                             (256 - i_line_percent) * ( 256 - i_col_percent );
 265                         temp+= i_linpix *
 266                             i_line_percent * (256 - i_col_percent );
 267                         temp+= i_nexpix *
 268                             ( i_col_percent) * ( i_line_percent);
 269                         temp+= i_colpix *
 270                             i_col_percent * (256 - i_line_percent );
 271                         *p_out = temp >> 16;
 272                     }
 273                 #ifdef test
 274                     else if (i_col_orig == i_visible_pitch/2 )
 275                     {   *p_out = black_pixel;
 276                     }
 277                     else
 278                         *p_out = *p_orig_offset;
 279                 #endif
 280                 #undef test
 281                 }
 282                 else
 283                 {
 284                     *p_out = black_pixel;
 285                 }
 286             }
 287         }
 288     }
 289
 290     return CopyInfoAndRelease( p_outpic, p_pic );
 291 }
 292
 293 /*****************************************************************************
 294  *
 295  *****************************************************************************/
 296 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
 297 {
 298     picture_t *p_outpic;
 299     filter_sys_t *p_sys = p_filter->p_sys;
 300     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 301
 302     if( !p_pic ) return NULL;
 303
 304     int i_u_offset, i_v_offset, i_y_offset;
 305
 306     if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
 307                              &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
 308     {
 309         msg_Warn( p_filter, "Unsupported input chroma (%4s)",
 310                   (char*)&(p_pic->format.i_chroma) );
 311         picture_Release( p_pic );
 312         return NULL;
 313     }
 314
 315     p_outpic = filter_NewPicture( p_filter );
 316     if( !p_outpic )
 317     {
 318         picture_Release( p_pic );
 319         return NULL;
 320     }
 321
 322     const uint8_t *p_in   = p_pic->p->p_pixels+i_y_offset;
 323     const uint8_t *p_in_u = p_pic->p->p_pixels+i_u_offset;
 324     const uint8_t *p_in_v = p_pic->p->p_pixels+i_v_offset;
 325
 326     const int i_pitch         = p_pic->p->i_pitch;
 327     const int i_visible_pitch = p_pic->p->i_visible_pitch>>1; /* In fact it's i_visible_pixels */
 328     const int i_visible_lines = p_pic->p->i_visible_lines;
 329
 330     uint8_t *p_out   = p_outpic->p->p_pixels+i_y_offset;
 331     uint8_t *p_out_u = p_outpic->p->p_pixels+i_u_offset;
 332     uint8_t *p_out_v = p_outpic->p->p_pixels+i_v_offset;
 333
 334     const int i_line_center = i_visible_lines>>1;
 335     const int i_col_center  = i_visible_pitch>>1;
 336
 337     int i_col, i_line;
 338     for( i_line = 0; i_line < i_visible_lines; i_line++ )
 339     {
 340         for( i_col = 0; i_col < i_visible_pitch; i_col++ )
 341         {
 342             int i_line_orig;
 343             int i_col_orig;
 344             /* Handle "1st Y", U and V */
 345             i_line_orig = i_line_center +
 346                 ( ( i_sin * ( i_col - i_col_center )
 347                   + i_cos * ( i_line - i_line_center ) )>>12 );
 348             i_col_orig = i_col_center +
 349                 ( ( i_cos * ( i_col - i_col_center )
 350                   - i_sin * ( i_line - i_line_center ) )>>12 );
 351             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
 352              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
 353             {
 354                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
 355                 i_col_orig /= 2;
 356                 p_out_u[i_line*i_pitch+2*i_col] = p_in_u[i_line_orig*i_pitch+4*i_col_orig];
 357                 p_out_v[i_line*i_pitch+2*i_col] = p_in_v[i_line_orig*i_pitch+4*i_col_orig];
 358             }
 359             else
 360             {
 361                 p_out[i_line*i_pitch+2*i_col] = 0x00;
 362                 p_out_u[i_line*i_pitch+2*i_col] = 0x80;
 363                 p_out_v[i_line*i_pitch+2*i_col] = 0x80;
 364             }
 365
 366             /* Handle "2nd Y" */
 367             i_col++;
 368             if( i_col >= i_visible_pitch )
 369                 break;
 370
 371             i_line_orig = i_line_center +
 372                 ( ( i_sin * ( i_col - i_col_center )
 373                   + i_cos * ( i_line - i_line_center ) )>>12 );
 374             i_col_orig = i_col_center +
 375                 ( ( i_cos * ( i_col - i_col_center )
 376                   - i_sin * ( i_line - i_line_center ) )>>12 );
 377             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
 378              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
 379             {
 380                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
 381             }
 382             else
 383             {
 384                 p_out[i_line*i_pitch+2*i_col] = 0x00;
 385             }
 386         }
 387     }
 388
 389     return CopyInfoAndRelease( p_outpic, p_pic );
 390 }
 391
 392 /*****************************************************************************
 393  * Angle modification callbacks.
 394  *****************************************************************************/
 395 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 396                            vlc_value_t oldval, vlc_value_t newval,
 397                            void *p_data )
 398 {
 399     oldval.i_int *= 10;
 400     newval.i_int *= 10;
 401     return PreciseRotateCallback( p_this, psz_var, oldval, newval, p_data );
 402 }
 403
 404 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 405                            vlc_value_t oldval, vlc_value_t newval,
 406                            void *p_data )
 407 {
 408     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 409     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 410     int i_sin, i_cos;
 411
 412     cache_trigo( newval.i_int, &i_sin, &i_cos );
 413     vlc_spin_lock( &p_sys->lock );
 414     p_sys->i_sin = i_sin;
 415     p_sys->i_cos = i_cos;
 416     vlc_spin_unlock( &p_sys->lock );
 417     return VLC_SUCCESS;
 418 }